From: King, Michael (MKing@bridgew.edu)
Date: Mon Oct 21 2002 - 12:49:18 CDT
Well, the way it was explained to me was this (with a little ad-libbing for
NetReg case scenario):
Your unregistered client powers on, and asks for an IP. DHCP returns an
unregistered address of 10.x.x.x
Client registers, and reboots.
Client ask for an IP. DHCP returns a registered address of 128.111.x.x
Since windows doesn't closely follow the RFC, it does not release it's
address when it shuts down. (like a good DHCP Client should). So the server
still has it's original address marked as leased out. Since the lease times
are only 2 minutes on the unregistered side, it doesn't matter. When it
asks for the second address, the one-lease-per-client directive requires the
DHCP server to note any existing leases, and marked them as released when
the new IP is handed out.
There is no performance hit, since the DHCP server must parse the entire
Leases file anyways.
We have been running with this directive for over a year and a half. We
have had nearly every combination of hardware, without a problem.
Well, that's not to say I haven't had problems of a different sort. I have
one client out there that will have forgotten it's IP, but still have it.
IE, it will do a discover, and the DHCP server will try to hand out the same
address it had. But since it still has it, it will return a ping. And the
DHCP server will abandon the IP. Then it will clear the abandon and try the
whole thing over.
On the DHCPD list, Ted has acknowledged it's a bug, and that a patch is in
the next Release Candidate, but that Candidate has not been released.
Oh well. I replaced the NIC card of the student to make it go away. :-)
Mike
-----Original Message-----
From: Daxter Gulje [mailto:dgulje@housing.ucsb.edu]
Sent: Monday, October 21, 2002 12:59 PM
To: netreg@southwestern.edu
Subject: RE: NetReg: more than 1 IP for the same ethernet address???
Just so I'm clear on the
one-lease-per-client true;
line, that won't interfere with the thousands of transactions going
on during a busy move-in week, right? That is to say, there won't be a
conflict when a client has a 10.x.x.x and request a valid, routable address?
Thanks for any info...
/Dax
__________________________________________
Daxter Gulje
Assistant ResNet Coordinator
University of California, Santa Barbara
805.893.4747
-----Original Message-----
From: King, Michael [mailto:MKing@bridgew.edu]
Sent: Monday, October 21, 2002 6:39 AM
To: 'netreg@southwestern.edu'
Subject: RE: NetReg: more than 1 IP for the same ethernet address???
Rebecca,
You might want to add this line:
one-lease-per-client true;
To the beginning of your dhcpd file. If you don't have it, I would also
suggest:
ignore bootp;
authoritative; # It's always right
One-lease-per-client is a little misleading. What it does is when a client
requests an IP, and the server notices that it already has an IP address, it
releases the other IP address, making it free for someone else to grab it.
I suggest ignoring bootp, cause those addresses never expire, and unless you
have a specific need for it, you won't really need to support it. And of
course, your machine should be authoritative for everything.
I wish I could help with the problem, but this should help with the
symptoms. (Kind of like aspirin)
Mike
-----Original Message-----
From: Rebecca Irvin [mailto:rirvin@mail.lesley.edu]
Sent: Monday, October 21, 2002 10:15 AM
To: netreg@southwestern.edu
Subject: Re: NetReg: more than 1 IP for the same ethernet address???
No, it's 00:40:CA:2E:00:D9. Have you run into this before?
I'm stumped!
Rebecca Irvin
Lesley University
Network Technitian
At 04:01 PM 10/18/02 -0500, you wrote:
>The MAC isn't by chance 02:03:8A:00:00:11 is it?
>
>Rebecca Irvin wrote:
>>Hey all,
>>I've come across a rather odd problem today.
>>I looked up a student's registration in netreg. Then I clicked the L
>>button and looked at her leases, and blinked when I saw that she had
>>not 1, but 3 valid and current IP leases for her machine! I checked
>>the machine's logs, and sure enough, that MAC address had continued
>>discovering after receiving the first lease, and received more valid
>>leases. This continued until it actually bottomed out on that
network.
>>Has anyone ever seen anything like this?
>>I'm running Red Hat 7.2 with the basic installation of NetReg Any
>>advice would be apreciated! Rebecca Irvin
>>Network Technitian
>>Lesley University
>>**********************************************************************
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>
>
>--
>Peter Valian
>Network & Systems Administrator
>Southwestern University
>Georgetown, Texas
>512.863.1586 office
>512.863.1605 fax
>--
>
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